US3716202A - Magnetically attracted bobbins - Google Patents

Magnetically attracted bobbins Download PDF

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Publication number
US3716202A
US3716202A US00106026A US3716202DA US3716202A US 3716202 A US3716202 A US 3716202A US 00106026 A US00106026 A US 00106026A US 3716202D A US3716202D A US 3716202DA US 3716202 A US3716202 A US 3716202A
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Prior art keywords
bobbin
paper
iron
magnetically
magnetically affected
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Expired - Lifetime
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US00106026A
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C Thomas
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Mississippi State University
Mississippi State Univ Dev Foundation Inc
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Mississippi State University
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    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B57/00—Loop takers, e.g. loopers
    • D05B57/28—Applications of bobbins for storing the lower thread
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H75/00—Storing webs, tapes, or filamentary material, e.g. on reels
    • B65H75/02—Cores, formers, supports, or holders for coiled, wound, or folded material, e.g. reels, spindles, bobbins, cop tubes, cans, mandrels or chucks
    • B65H75/04—Kinds or types
    • B65H75/08—Kinds or types of circular or polygonal cross-section
    • B65H75/14—Kinds or types of circular or polygonal cross-section with two end flanges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/30—Handled filamentary material
    • B65H2701/31—Textiles threads or artificial strands of filaments
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/50—Storage means for webs, tapes, or filamentary material
    • B65H2701/51—Cores or reels characterised by the material
    • B65H2701/511—Cores or reels characterised by the material essentially made of sheet material
    • B65H2701/5112—Paper or plastic sheet material
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05D—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES D05B AND D05C, RELATING TO SEWING, EMBROIDERING AND TUFTING
    • D05D2207/00—Use of special elements
    • D05D2207/05—Magnetic devices

Definitions

  • ABSTRACT [52] US. Cl. ..242/118.7, 242/1 18.32, 264/24 Disposable magnetically affected Sewing bobbins [51] Int. Cl. ..B65ll 75/14 formed f paper or plastic impregnated or coated with [58] Field of Search..242/l 18.7, 118.8, 118.6, 118.4,
  • particulate iron powder or other magnetically affected material is particulate iron powder or other magnetically affected material.
  • This invention relates to magnetically attracted bobbins and particularly to paper throwaway bobbins having magnetically affected means incorporated therewith such as iron (Fe), iron alloys and other magnetizable materials incorporated in the completed paper bobbin.
  • Bobbins travel at relatively high speeds and must be controlled. It is known in the art to control a metal bobbin by means of a magnetic field and some lock stitch sewing machines have magnetic bobbin controls thereon for the purpose of producing a drag or tension and/or to stop backlash on the high speed sewing machines. Bobbins used with such machines are metal of special construction and are not considered as inexpensive or disposable bobbins. There is a demand in the industry for an inexpensive, magnetically affected bobbin which can be used with high speed sewing machine.
  • Thomas, U.S. Pat. No. 2,561,155 discloses a magnetic bobbin holding means having a flange constructed of a non-ferrous material with a ferrous disc affixed thereto.
  • Green, British Pat. specification No. 879,085 discloses a bobbin having a layer of copper foil bonded thereto.
  • the bobbins of this invention comprise a bobbin support core formed of nonmagnetically affected material, at least the exterior surfaces of which comprise a magnetically affected material in particulate form.
  • the magnetically affected bobbins of this invention comprise a bobbin core formed of a non-magnetically affected material, e.g., polyethylene, polypropylene or other polyolefin or thermoplastic polymer, melamineformaldehyde resin or other thermosetting resin, or paper.
  • a non-magnetically affected material e.g., polyethylene, polypropylene or other polyolefin or thermoplastic polymer, melamineformaldehyde resin or other thermosetting resin, or paper.
  • the bobbin is in the form of a paper bobbin made from bobbin paper stock, such as that which is produced for the manufacture of Clarks Bobbin made for Coates and Clark or bobbins which carry the identification ATCO.
  • a magnetic means such as iron, iron alloy and other magnetizable materials is applied to or blended with the paper so that the subsequently completed bobbin includes a magnetically affected material. Any other magnetically affected compound, alloy or element that is affected by or responsive to a magnetic field may be used.
  • magnetic iron, iron alloys, etc. such as those marketed by C.K. Williams Company of Easton, Pennsylvania may be used.
  • a material such as Mylar, plastic or other sheet material that has been laminated or coated with a magnetically attracted means such as iron, iron alloys and other magnetizable materials, such as that produced by the Three M Company and used on brands of magnetic tape under the name SCOTCH" may be applied by heat sealing or gluing to the surfaces of a paper bobbin thereby to provide a magnetically effective bobbin.
  • An object of this invention is to provide an inexpensive bobbin having properties whereby the bobbin is affected by a magnetic field so that the speed of the bobbin on a machine may be controlled thereby.
  • a further object of this invention is to provide a disposable paper bobbin which incorporates a magnetically affected material such as iron, iron alloys and other magnetizable material in the paper used to manufacture the bobbin.
  • Another object of this invention is to provide a paper disposable bobbin which is provided with a coating of magnetic iron, iron alloys and other magnetizable materials or other magnetically affected materials to render the disposable bobbin subject to a magnetic field.
  • Another object of this invention resides in the construction of a disposable bobbin wherein a paper or similar disposable bobbin is provided with a laminated film that has been attached to the bobbin material.
  • FIG. 1 is a cross-sectional view of a paper disposable bobbin having magnetically affected means such as iron alloys laminated with film attached thereon.
  • FIG. 2 is a top plan vie of the device shown in FIG. 1.
  • FIG. 3 is a cross-sectional view of a modified form of the invention which is a paper disposable bobbin having a magnetically affected means such as magnetic iron materials incorporated in the paper material and present at the time the paper is manufactured into a disposable bobbin.
  • a magnetically affected means such as magnetic iron materials incorporated in the paper material and present at the time the paper is manufactured into a disposable bobbin.
  • FIG. 4 is a top plan view of the device shown in FIG. 3.
  • FIG; 5 is a cross-sectional view of a paper disposable bobbin which has been coated with a magnetically attracted material such as iron powder to provide a magnetically affected iron coated thereon to produce still another modified form of the present invention.
  • a magnetically attracted material such as iron powder
  • FIG. 6 is a top plan view of the device shown in FIG. 5.
  • a paper disposable bobbin of the sort which is labeled Style L," Size 40, CLARKS BOBBIN, COATES AND CLARK, 430 Park Avenue, New York, New York or a paper bobbin labeled and sold under the trademark ATCO, is made from a pair of circular members 12, 14 of identical construction which is stamped from a continuous sheet of paper bobbin material, with respective center opening 16 therein receives a tubular core 18 manufactured from the same paper material and having cylindrical ends 18, 20 that are flanged to be held inside of respective opening 16.
  • This disposable bobbin construction 10 recited above and in assembled form is a common disposable bobbin in the trade.
  • a laminated sheet of plastic MYLAR material or any other similar material has been coated with a magnetic powder 23 which includes iron, iron alloys or other magnetizable materials that are affected by a magnetic field.
  • the members 22, 24 are circular and correspond with and are superposed over corresponding members l2, l4 and attached thereto by heat sealing or glue.
  • the entire bobbin 10 is thereby rendered magnetically affected by, a magnetic field and may be used on any suitable machine which includes a magnetic pole or bobbin case. Any substance, element, compound, or alloy may be used that is magnetizable or responsive, even momentarily, to a magnetic field.
  • paper stock of the sort described previously used in connection with either ATCO or CLARK'S BOBBlNS have incorporated in the paper a magnetically affected material such as a fine compound of iron (Fe), iron alloys and other magnetizable materials which is impregnated into the paper material.
  • a magnetically affected material such as a fine compound of iron (Fe), iron alloys and other magnetizable materials which is impregnated into the paper material.
  • the circular portions 52, 54 and the center portion 56 have throughout the cross-section thereof the magnetic material, which may be in the form of the iron, iron alloys or other magnetizable materials, particles, spread substantially throughout the interior thereof. This renders the entire bobbin subject to and affected by a magnetic field and, in the case of the embodiment shown in FIG. 3, the bobbin may be used on any machine employing a magnetic control.
  • a disposable paper bobbin of the sort mentioned previously either the ATCO or the CLARK bobbin is dipped or sprayed with a magnetically affected material, such as a magnetic iron, iron alloys and other magnetizable materials of the sort produced by CK. Williams Company, of Easton, Pennsylvania, etc., to provide a coating over the disposable bobbin 60 extending over and around the circular bobbin portions 62 and the corresponding and opposite bobbin portion 64 as well as the center, tubular, cylindrical core 66 is coated with the iron material.
  • the bobbin 60 is rendered susceptible to and attracted to magnetic fields and may be used on those high speed sewing machines which include magnetic bobbin controls.
  • a magnetically affected disposable paper bobbin at least the exterior surfaces of which comprise a magnetically affected material in particulate form.
  • the bobbin of claim 2 wherein the magnetically affected material is an iron compound.
  • the bobbin of claim 5 wherein the magnetically affected material is an iron compound.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Storage Of Web-Like Or Filamentary Materials (AREA)

Abstract

Disposable magnetically affected sewing bobbins formed of paper or plastic impregnated or coated with particulate iron powder or other magnetically affected material.

Description

United States Patent 1191 1111 3,716,202 Thomas 1 Feb. 13, 1973 1' MAGNETICALLY ATTRACTED [56] References Cited ROBBINS UNITED STATES PATENTS 1 [75] Inventor: Charles C. Thomas, Starkville, Miss.
- 3,061,888 11/1962 Wadham ..264/24 ASSIgIISSI MISSISSIPPI State UIIIveISiIy p- 3,202,375 8/1965 Dinkin ..242 74 men! o State 2,561,155 7/1951 Thomas, Jr. et a1 ..242/46.21
lege, Miss. [22] Filed: I 7 Jan. 13, 1971 I Primary Examiner-George F. Mautz AnomeyM1llen, Raptes & Wh1te [21] Appl. No.: 106,026
1 [57] ABSTRACT [52] US. Cl. ..242/118.7, 242/1 18.32, 264/24 Disposable magnetically affected Sewing bobbins [51] Int. Cl. ..B65ll 75/14 formed f paper or plastic impregnated or coated with [58] Field of Search..242/l 18.7, 118.8, 118.6, 118.4,
particulate iron powder or other magnetically affected material.
7 Claims, 6 Drawing Figures PAIENIEUFEBIBIQB r 3,716,202
INV ENTOR CHARLES C. THOMAS ATTORNEYS MAGNETICALLY ATTRACTED BOBBINS BACKGROUND OF THE INVENTION This invention relates to magnetically attracted bobbins and particularly to paper throwaway bobbins having magnetically affected means incorporated therewith such as iron (Fe), iron alloys and other magnetizable materials incorporated in the completed paper bobbin.
Bobbins travel at relatively high speeds and must be controlled. It is known in the art to control a metal bobbin by means of a magnetic field and some lock stitch sewing machines have magnetic bobbin controls thereon for the purpose of producing a drag or tension and/or to stop backlash on the high speed sewing machines. Bobbins used with such machines are metal of special construction and are not considered as inexpensive or disposable bobbins. There is a demand in the industry for an inexpensive, magnetically affected bobbin which can be used with high speed sewing machine.
Thomas, U.S. Pat. No. 2,561,155 discloses a magnetic bobbin holding means having a flange constructed of a non-ferrous material with a ferrous disc affixed thereto. Green, British Pat. specification No. 879,085, discloses a bobbin having a layer of copper foil bonded thereto. For other structures, see U.S. Pat. Nos. 2,684,815; 2,784,690 and 3,061,888.
SUMMARY OF THE INVENTION The bobbins of this invention comprise a bobbin support core formed of nonmagnetically affected material, at least the exterior surfaces of which comprise a magnetically affected material in particulate form.
DETAILED DISCUSSION The magnetically affected bobbins of this invention comprise a bobbin core formed of a non-magnetically affected material, e.g., polyethylene, polypropylene or other polyolefin or thermoplastic polymer, melamineformaldehyde resin or other thermosetting resin, or paper. Preferably, the bobbin is in the form of a paper bobbin made from bobbin paper stock, such as that which is produced for the manufacture of Clarks Bobbin made for Coates and Clark or bobbins which carry the identification ATCO. In the manufacture of the paper stock, a magnetic means such as iron, iron alloy and other magnetizable materials is applied to or blended with the paper so that the subsequently completed bobbin includes a magnetically affected material. Any other magnetically affected compound, alloy or element that is affected by or responsive to a magnetic field may be used.
For this purpose, magnetic iron, iron alloys, etc., such as those marketed by C.K. Williams Company of Easton, Pennsylvania may be used. In another form of the invention, a material such as Mylar, plastic or other sheet material that has been laminated or coated with a magnetically attracted means such as iron, iron alloys and other magnetizable materials, such as that produced by the Three M Company and used on brands of magnetic tape under the name SCOTCH" may be applied by heat sealing or gluing to the surfaces of a paper bobbin thereby to provide a magnetically effective bobbin.
An object of this invention is to provide an inexpensive bobbin having properties whereby the bobbin is affected by a magnetic field so that the speed of the bobbin on a machine may be controlled thereby.
A further object of this invention is to provide a disposable paper bobbin which incorporates a magnetically affected material such as iron, iron alloys and other magnetizable material in the paper used to manufacture the bobbin.
Another object of this invention is to provide a paper disposable bobbin which is provided with a coating of magnetic iron, iron alloys and other magnetizable materials or other magnetically affected materials to render the disposable bobbin subject to a magnetic field.
Another object of this invention resides in the construction of a disposable bobbin wherein a paper or similar disposable bobbin is provided with a laminated film that has been attached to the bobbin material.
Other and further objects and advantages of my invention will become apparent upon reading the following specification taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a cross-sectional view of a paper disposable bobbin having magnetically affected means such as iron alloys laminated with film attached thereon.
FIG. 2 is a top plan vie of the device shown in FIG. 1.
FIG. 3 is a cross-sectional view of a modified form of the invention which is a paper disposable bobbin having a magnetically affected means such as magnetic iron materials incorporated in the paper material and present at the time the paper is manufactured into a disposable bobbin.
FIG. 4 is a top plan view of the device shown in FIG. 3.
FIG; 5 is a cross-sectional view of a paper disposable bobbin which has been coated with a magnetically attracted material such as iron powder to provide a magnetically affected iron coated thereon to produce still another modified form of the present invention.
FIG. 6 is a top plan view of the device shown in FIG. 5.
Referring initially to the embodiment shown in FIG. 1, a paper disposable bobbin of the sort which is labeled Style L," Size 40, CLARKS BOBBIN, COATES AND CLARK, 430 Park Avenue, New York, New York or a paper bobbin labeled and sold under the trademark ATCO, is made from a pair of circular members 12, 14 of identical construction which is stamped from a continuous sheet of paper bobbin material, with respective center opening 16 therein receives a tubular core 18 manufactured from the same paper material and having cylindrical ends 18, 20 that are flanged to be held inside of respective opening 16.
This disposable bobbin construction 10 recited above and in assembled form is a common disposable bobbin in the trade.
In the embodiment shown in FIG. 1, a laminated sheet of plastic MYLAR material or any other similar material, has been coated with a magnetic powder 23 which includes iron, iron alloys or other magnetizable materials that are affected by a magnetic field. The members 22, 24 are circular and correspond with and are superposed over corresponding members l2, l4 and attached thereto by heat sealing or glue. In
accordance with this arrangement, the entire bobbin 10 is thereby rendered magnetically affected by, a magnetic field and may be used on any suitable machine which includes a magnetic pole or bobbin case. Any substance, element, compound, or alloy may be used that is magnetizable or responsive, even momentarily, to a magnetic field.
In the embodiment shown in FIG. 3, paper stock of the sort described previously used in connection with either ATCO or CLARK'S BOBBlNS, have incorporated in the paper a magnetically affected material such as a fine compound of iron (Fe), iron alloys and other magnetizable materials which is impregnated into the paper material. When the bobbin S is manufactured, the circular portions 52, 54 and the center portion 56 have throughout the cross-section thereof the magnetic material, which may be in the form of the iron, iron alloys or other magnetizable materials, particles, spread substantially throughout the interior thereof. This renders the entire bobbin subject to and affected by a magnetic field and, in the case of the embodiment shown in FIG. 3, the bobbin may be used on any machine employing a magnetic control.
In the embodiment shown in FIGS. and 6, a disposable paper bobbin of the sort mentioned previously, either the ATCO or the CLARK bobbin is dipped or sprayed with a magnetically affected material, such as a magnetic iron, iron alloys and other magnetizable materials of the sort produced by CK. Williams Company, of Easton, Pennsylvania, etc., to provide a coating over the disposable bobbin 60 extending over and around the circular bobbin portions 62 and the corresponding and opposite bobbin portion 64 as well as the center, tubular, cylindrical core 66 is coated with the iron material. Thus, as in the case of the previous embodiments the bobbin 60 is rendered susceptible to and attracted to magnetic fields and may be used on those high speed sewing machines which include magnetic bobbin controls.
It is common in the printing industry at this time to incorporate magnetically affected particles such as iron compounds into the printing ink. Therefore, a coating of magnetically affected material can be provided by printing one of the paper bobbins with such ink.
While I have shown and described preferred embodiments of my invention, this is by way of illustration only, and does not constitute any sort of limitation on the scope of my invention since various alterations, changes, deviations, eliminations, variations and ramifications may be made in the embodiment shown and described without departing from the scope of my invention as defined in the appended claims.
What is claimed is:
l. A magnetically affected disposable paper bobbin, at least the exterior surfaces of which comprise a magnetically affected material in particulate form.
2. The bobbin of claim 1 wherein the magnetically affected material is dispersed in the paper.
3. The bobbin of claim 2 wherein the magnetically affected material is an iron compound.
4. The bobbin of claim 3 wherein the iron compound is iron powder.
5. The bobbin of claim 1 wherein the magnetically affected material is present in a coating on all of the exterior surfaces of the bobbin.
6. The bobbin of claim 5 wherein the magnetically affected material is an iron compound.
7. The bobbin of claim 6 wherein the iron compound is iron powder.

Claims (6)

1. A magnetically affected disposable paper bobbin, at least the exterior surfaces of which comprise a magnetically affected material in particulate form.
2. The bobbin of claim 1 wherein the magnetically affected material is dispersed in the paper.
3. The bobbin of claim 2 wherein the magnetically affected material is an iron compound.
4. The bobbin of claim 3 wherein the iron compound is iron powder.
5. The bobbin of claim 1 wherein the magnetically affected material is present in a coating on all of the exterior surfaces of the bobbin.
6. The bobbin of claim 5 wherein the magnetically affected material is an iron compound.
US00106026A 1971-01-13 1971-01-13 Magnetically attracted bobbins Expired - Lifetime US3716202A (en)

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4458854A (en) * 1982-10-15 1984-07-10 International Business Machines Corporation Magnetic clutch having apparatus for centering magnetic recording tape reel
WO1998035902A1 (en) * 1997-02-18 1998-08-20 Barbour Threads, Inc. Detectable bobbin and core
EP0860355A1 (en) 1997-02-25 1998-08-26 Deutsches Zentrum für Luft- und Raumfahrt e.V. Aerodynamic structure with variable camber such as landing flaps, airfoil, horizontal and vertical stabilizer
WO2000036201A2 (en) * 1998-12-16 2000-06-22 Fil-Tec, Inc. Magnetized pre-wound sideless bobbins
US6315227B1 (en) * 1999-11-23 2001-11-13 Fil-Tec, Inc. Bobbin cores for sideless pre-wound sewing thread bobbins and methods of winding the same
US6585181B2 (en) * 2001-02-27 2003-07-01 Ronald Kronenberger Bobbin assembly with backlash preventing structure
US6659384B2 (en) 2001-08-21 2003-12-09 J. & P. Coats Limited Pre-wound bobbin with magnetized flange
US20040245364A1 (en) * 2003-06-06 2004-12-09 Ronald Kronenberger Sewing system with thread draw tension adjusting capability and a method of adjusting the thread draw tension
US20090090801A1 (en) * 2007-10-04 2009-04-09 Klaus Walter Roehr Schnakenbeck Sidewall thread bobbin
US20220135365A1 (en) * 2019-08-23 2022-05-05 Suzhou Tianyu Plastic Co., Ltd. Winding core tube with uniformly rough surface
US11731849B2 (en) * 2011-08-31 2023-08-22 Pregis Intellipack Llc Spindle mechanism for protective packaging device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2561155A (en) * 1950-02-18 1951-07-17 U S Textile Machine Company Magnetic bobbin holding means
US3061888A (en) * 1959-12-28 1962-11-06 Ambrose E Wadham Method of manufacturing a reinforced plastic article
US3202375A (en) * 1964-03-23 1965-08-24 Leon W Dinkin Self-threading tape recording reel

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2561155A (en) * 1950-02-18 1951-07-17 U S Textile Machine Company Magnetic bobbin holding means
US3061888A (en) * 1959-12-28 1962-11-06 Ambrose E Wadham Method of manufacturing a reinforced plastic article
US3202375A (en) * 1964-03-23 1965-08-24 Leon W Dinkin Self-threading tape recording reel

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4458854A (en) * 1982-10-15 1984-07-10 International Business Machines Corporation Magnetic clutch having apparatus for centering magnetic recording tape reel
WO1998035902A1 (en) * 1997-02-18 1998-08-20 Barbour Threads, Inc. Detectable bobbin and core
US5875983A (en) * 1997-02-18 1999-03-02 Barbour Threads, Inc. Detectable bobbin and core
EP0860355A1 (en) 1997-02-25 1998-08-26 Deutsches Zentrum für Luft- und Raumfahrt e.V. Aerodynamic structure with variable camber such as landing flaps, airfoil, horizontal and vertical stabilizer
US6257512B1 (en) 1998-12-16 2001-07-10 Fil-Tec, Inc. Magnetized pre-wound sideless bobbins
WO2000036201A3 (en) * 1998-12-16 2000-09-14 Fil Tec Inc Magnetized pre-wound sideless bobbins
WO2000036201A2 (en) * 1998-12-16 2000-06-22 Fil-Tec, Inc. Magnetized pre-wound sideless bobbins
US6315227B1 (en) * 1999-11-23 2001-11-13 Fil-Tec, Inc. Bobbin cores for sideless pre-wound sewing thread bobbins and methods of winding the same
US6585181B2 (en) * 2001-02-27 2003-07-01 Ronald Kronenberger Bobbin assembly with backlash preventing structure
US6659384B2 (en) 2001-08-21 2003-12-09 J. & P. Coats Limited Pre-wound bobbin with magnetized flange
US20040245364A1 (en) * 2003-06-06 2004-12-09 Ronald Kronenberger Sewing system with thread draw tension adjusting capability and a method of adjusting the thread draw tension
US20090090801A1 (en) * 2007-10-04 2009-04-09 Klaus Walter Roehr Schnakenbeck Sidewall thread bobbin
US11731849B2 (en) * 2011-08-31 2023-08-22 Pregis Intellipack Llc Spindle mechanism for protective packaging device
US20220135365A1 (en) * 2019-08-23 2022-05-05 Suzhou Tianyu Plastic Co., Ltd. Winding core tube with uniformly rough surface
US11731855B2 (en) * 2019-08-23 2023-08-22 Suzhou Tianyu Plastic Co., Ltd. Winding core tube with uniformly rough surface

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